Acetylene is a colorless gas used in welding and cutting applications. Combustion of acetylene with oxygen produces a flame of over 3600°K (3300°C, 6000°F), releasing 11.8 kJ/g. Acetylene, when mixed with oxygen, lends itself easily to welding, cutting, brazing, braze-welding, metal heating (for annealing or tempering, bending or forming), the loosening of corroded nuts and bolts and other ...